252521665 has 32 divisors (see below), whose sum is σ = 341978112. Its totient is φ = 177408000.

The previous prime is 252521657. The next prime is 252521693. The reversal of 252521665 is 566125252.

It is not a de Polignac number, because 252521665 - 2³ = 252521657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 252521665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254320 + ... + 255310.

It is an arithmetic number, because the mean of its divisors is an integer number (10686816).

Almost surely, 2^252521665 is an apocalyptic number.

It is an amenable number.

252521665 is a deficient number, since it is larger than the sum of its proper divisors (89456447).

252521665 is a wasteful number, since it uses less digits than its factorization.

252521665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its digits is 36000, while the sum is 34.

The square root of 252521665 is about 15890.9302748455. The cubic root of 252521665 is about 632.0715090600.

The spelling of 252521665 in words is "two hundred fifty-two million, five hundred twenty-one thousand, six hundred sixty-five".